高掺量粉煤灰混凝土在干湿循环-碳化耦合作用下的耐久性研究  

Durability Properties Research on High Volume Fly Ash(HVFA) Concrete under Carbonation and Drying-wetting Cycles Coupling Effect

作　　者：郑薇薇[1] 高建明[2] 祁兵[2] 马立彬[2] 

机构地区：[1]江苏省交通运输厅航道局,南京210004 [2]东南大学材料学院江苏省土木工程材料重点实验室,南京211189

出　　处：《混凝土与水泥制品》2014年第12期23-27,共5页China Concrete and Cement Products

基　　金：江苏省交通科学研究计划项目(2012T06-2)

摘　　要：对适用于河道护岸的高掺量粉煤灰混凝土在干湿循环-碳化耦合作用下的耐久性能进行了研究。与单一因素作用相比,在多因素耦合作用下粉煤灰混凝土的质量增加,相对动弹性模量下降,碳化深度也明显大于标准快速碳化试验值。采用环境扫描电镜(ESEM)对粉煤灰混凝土的微观结构进行了分析。试验结果表明,多因素耦合作用对混凝土造成了更进一步的损伤;粉煤灰掺量对混凝土在多因素耦合作用下的质量损失及相对动弹性模量有较大影响;掺入粉煤灰后混凝土的抗碳化性能下降。An experimental study on the durability properties of high volume fly ash（HVFA） concrete that is suitable for channel revetment is carried out. The research on durability properties is under carbonation and drying-wetting cycles coupling effects. Compared with the single damage process, the weights of concrete increase and the relative dynamic modulus of elasticity decrease under coupling effects. And carbonation depths are significantly larger than that of the standard carbonation test. Environmental scanning electron microscope（ESEM） is used to investigate the microstructure variation of HVFA concrete. It is revealed that coupling effects cause some damage to the concretes. The incorporation of fly ash has obvious influence on the weight loss and relative dynamic modulus of elasticity. The carbonation resistance of the fly ash concrete is lower than that of the reference concrete.

关 键 词：高掺量粉煤灰混凝土 干湿循环 碳化 耦合作用 

分 类 号：TU528.041[建筑科学—建筑技术科学]